C# split string but keep separators -

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there exist similar questions, of them use regexen. code i'm using (that strips separators):

string[] sentences = s.split(new string[] { ". ", "? ", "! ", "... " }, stringsplitoptions.none);

i split block of text on sentence breaks , keep sentence terminators. i'd avoid using regexen performance. possible?

i don't believe there existing function this. can use following extension method. 

public static ienumerable<string> splitandkeepseparators(this string source, string[] separators) {   var builder = new text.stringbuilder();   foreach (var cur in source) {     builder.append(cur);     if (separators.contains(cur)) {       yield return builder.tostring();       builder.length = 0;     }   }   if (builder.length > 0) {     yield return builder.tostring();   } }

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